Albert Widmann (8 June 1912 – 24 December 1986) was an SS officer and German chemist who worked for the Action T4 euthanasia program during the regime of Nazi Germany.

However, in July 1933, as a student, Widmann joined the National Socialist Motor Corps (Nationalsozialistisches Kraftfahrkorps, NSKK).

Although Widmann was not directly employed by Action T4, he and his KTI office provided the program with the needed support services.

In the early stages of T-4, Widmann discussed possible gassing methods with Viktor Brack to determine the best way to kill patients with gas.

[1][4] Others who attended the first gassing included Philipp Bouhler, Karl Brandt, Viktor Brack, Leonardo Conti and Christian Wirth as well as other officials and physicians from T4 headquarters in Berlin.

Widmann visited other T-4 centers only when solutions to technical problems needed to be tested, such as, when the crematorium in Sonnenstein Euthanasia Centre did not function correctly.

[5] With Arthur Nebe, commander of Einsatzgruppe B, and an unnamed explosives expert, Widmann experimented with dynamite as a means to kill patients, and also tested ways to pipe gas from a motor exhaust to the interior of a chamber: In September 1941, Einsatzgruppe B was faced with the task of liquidating the patients of the lunatic asylums in the cities of Minsk and Mogilev.

Dr. Widmann of the Criminal Police was sent to Nebe in Minsk, but before he left, Dr. Widmann discussed with the director of the Criminal Police Technological Institute, Dr. Heess, ways of using the carbon monoxide gas from automobile exhaust for killing operations in the East, based on the experience gained from the euthanasia program.

In the local lunatic asylum, a room with twenty to thirty of the insane was closed hermetically, and two pipes were driven into the wall.

One night after a party Nebe had driven home drunk, parked in his garage and fell asleep with the car engine running.

When a prototype gas van was driven to KTI, Widmann explained to his young chemists that by adjusting the timing of the ignition, one could maximize the amount of poisonous carbon monoxide in the exhaust.

[7] Some of Widmann's other experiments included testing poisoned ammunition on prisoners at Sachsenhausen concentration camp, which killed the subjects.

He was sentenced by a Düsseldorf court to five years in prison for aiding and abetting murder through poisoned ammunitions experiments.

With time served before and after the trial, his remaining sentence was suspended in exchange for a payment of 4,000 DM to a non-profit institution for the disabled.